Table of Contents

copyleft

copyleft: /kop'ee-left/ [play on `copyright'] n. 1. The copyright notice (`General Public License') carried by GNU EMACS and other Free Software Foundation software, granting reuse and reproduction rights to all comers (but see also General Public Virus). 2. By extension, any copyright notice intended to achieve similar aims.
http://www.tuxedo.org/~esr/jargon/html/entry/copyleft.html

“All knowledge all discoveries belong to everybody. … All knowledge all discoveries belong to you by right. It is time to demand what belongs to you.” – William S. Burroughs, The Job

Licenses For Works Besides Software and Documentation

Note, though, that the GNU GPL can be used for general data which is not software, as long as one can determine what the definition of “source code” refers to in the particular case. As it turns out, the DSL also requires that you determine what the “source code” is, using approximately the same definition that the GPL uses.